Osburn OB04002 - Manual (Page 39)

Stratford Fireplace Installation and Operation Manual
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6.3.1.2 On the floor or on a raised base of less than 4" installation (R value for the hearth
extension required)
In the case where the fireplace is installed directly on the floor or on a raised base of less than 4",
an R value for the hearth extension is required. In these case also, the joint between the hearth
extension and the fireplace (E) must be protected by a non-combustible material. For example, a
sheet metal (not included).
Note that the floor under of the fireplace should match or exceed the height of the floor
protection.
MINIMUM MEASUREMENT
E 2" (51 mm)